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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchlib/index/postinglistfile.h>
#include <vespa/searchlib/bitcompression/compression.h>
#include <vespa/searchlib/bitcompression/posocccompression.h>
#include <vespa/searchlib/bitcompression/posocc_fields_params.h>
#include <vespa/searchlib/fef/termfieldmatchdataarray.h>
#include "zc4_posting_params.h"
namespace search::diskindex {
class ZcPosOccRandRead : public index::PostingListFileRandRead
{
protected:
std::unique_ptr<FastOS_FileInterface> _file;
uint64_t _fileSize;
Zc4PostingParams _posting_params;
uint64_t _numWords; // Number of words in file
uint64_t _fileBitSize;
uint64_t _headerBitSize;
bitcompression::PosOccFieldsParams _fieldsParams;
public:
ZcPosOccRandRead();
~ZcPosOccRandRead();
using PostingListCounts = index::PostingListCounts;
using PostingListHandle = index::PostingListHandle;
/**
* Create iterator for single word. Semantic lifetime of counts and
* handle must exceed lifetime of iterator.
*/
std::unique_ptr<queryeval::SearchIterator>
createIterator(const PostingListCounts &counts, const PostingListHandle &handle,
const fef::TermFieldMatchDataArray &matchData, bool usebitVector) const override;
/**
* Read (possibly partial) posting list into handle.
*/
void readPostingList(const PostingListCounts &counts, uint32_t firstSegment,
uint32_t numSegments, PostingListHandle &handle) override;
bool open(const vespalib::string &name, const TuneFileRandRead &tuneFileRead) override;
bool close() override;
template <typename DecodeContext>
void readHeader(const vespalib::string &identifier);
virtual void readHeader();
static const vespalib::string &getIdentifier();
static const vespalib::string &getSubIdentifier();
const index::FieldLengthInfo &get_field_length_info() const override;
};
class Zc4PosOccRandRead : public ZcPosOccRandRead
{
using ZcPosOccRandRead::readHeader;
public:
Zc4PosOccRandRead();
void readHeader() override;
static const vespalib::string &getIdentifier();
static const vespalib::string &getSubIdentifier();
};
}
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